/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.axis2.webapp;

import java.io.Serializable;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;

final class CSRFTokenCache implements Serializable {
    private static final long serialVersionUID = 1L;

    private final Set<String> tokens = new LinkedHashSet<String>();

    synchronized void add(String token) {
        tokens.add(token);
        if (tokens.size() > 10) {
            Iterator<String> it = tokens.iterator();
            it.next();
            it.remove();
        }
    }

    synchronized boolean isValid(String token) {
        return tokens.contains(token);
    }
}
